- The application of a new highly-sensitive radioimmunoassay for plasma 21-deoxycortisol to the detection of steroid-21-hydroxylase deficiency. Fiet, J., Villette, J.M., Galons, H., Boudou, P., Burthier, J.M., Hardy, N., Soliman, H., Julien, R., Vexiau, P., Gourmelen, M. Ann. Clin. Biochem. (1994)